The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and

Where, WioACTis the Actual Operating Bond Work Index (kWh/t), W is the specific energy input (kWh/t), P80 is the 80% passing size of product (µm), and F80 is the 80% passing size of circuit feed (µm). 2. Calculate the Standard Circuit Bond Work Index (WiSTD) for the material being processed (equation 3). Wtotal

Design for Comminution circuits. Bond Ball mill Grindability Grindability Tests The rod mill work Index is also normally distributed with and average and median of 14.8kWh/t It is common to observe difference between the ball and rod mill caused by variation in ore hardness. The test has been mainly used for the design of rod mill or primary ...

Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5 ). Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral ( Chapter 12 ).

We require a minimum of the feed size (F80), product size (P80), Bond Ball Mill Work Index (kWh/mt), feed rate (tons/hr) and Ore Specific Gravity (t/m). However, we would prefer to have more detail so that a proper mill sizing assessment can be completed. Please complete the attached form with as much detail as possible.

The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm.

published his method of energy calculation with an index called Bond work index (Bond 1961). In the 1970s, the population balance or selection and breakage function model was at the forefront of research (Fuerstenau et al. 1973). A number of advancements were made in the application of this model to ball mill grinding.

Where Wi is the work index, W is the work input (motor output) and F and P are the 80% passing sizes of the feed and product respectively, in micrometers. This relationship between feed and product energies and the calculation by difference of the required grinding energy is the basis for the two Bond Rod and Ball Mill Work Index Tests. Both were

Ball Mill Designpower Calculation. The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics bond work index bulk density specific density desired mill tonnage capacity dtph operating solids or pulp density feed size as f80 and maximum chunk size product size as p80 and maximum and …

Ball mill, rod mill, cement mill, ball crusher, mining machine, Buy ... The Ball Mill is used to grind many kinds of mine and other materials, or to select the mine. ... This machine run steadily and works reliably. ... will enter the second hopper, which has plane scale board with steel ball inside to grind material.

Ball Mill power, kW 40596 39318 40006 Pebbles power, kW 806 806 868 Pso, !liD 181 186 193 EsAC 5.72 5.53 5.22 Eaalls 10.17 9.51 8.97 Aminpro Aminpro's method is based on SPI and Bond work index scale-up methods as described elsewhere (Amelunxen & Meadows, 2011). The approach is based on the use of industrial plant audit data and

With a Bond Work index-based Phantom Cyclone Approach (1989) *E SSBM for secondary/tertiary crushing and single-stage ball milling (Rowland, 1982) Net power for AG/SAG mills kW (net) = P N * ρ * D 2.5 * L. Legend. P N = power number* ρ = mill charge density (Loveday, 1979) D = diameter (net effective inside shell liners/lifters)

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Essa® Bond Test-Work Equipment. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930's.

Jul 15, 2013· The work index Wi can be determined from plant operations and from laboratory ball mill grindability, rod mill grindability, and impact crushing tests. The laboratory test results are used to check the efficiency of commercial operations and to compute the proper machine sizes for new installations.

The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial...

A Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell's inside surface and no balls will fall from its position onto the shell. The imagery below helps explain what goes on inside a mill as speed varies. Use our online formula. The mill speed is typically defined as the percent of the …

Testwork: Bond Rod Mill Work Index. The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus. The SAGMILLING.COM models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave ...

Jun 19, 2015 The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum chunk size, product size as P80 ...

Expert process know-how, advanced equipment design and complete service. We provide comprehensive solutions that increase throughput, improve safety, contribute to sustainability and much more. High-performance SAG and ball mill liners for all minerals processing applications. Built to last longer and occupy less volume within your mill.

Bonds Work Index Ball Mill Inner Liners Design. Bonds Work Index Ball Mill Inner Liners Design. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stagecrushed to 100 passing size of lt335 mm Any screen size below 600181m can be used for the testwork …

The Bond Ball Mill Work index (BBWi) is the industry standard procedure for assessing the grindability of ores. The test involves conducting a locked-cycle grinding test using Bond's standard mill design. The locked-cycle test enables a batch process to emulate the grinding behaviour of a continuous mill with a 250% recirculating load.

The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm.

The work indices developed by Bond, 1952, Rittinger, 1867 or Kick (1885) express the comminution work of optimized ball mills. In this study, we considered two types of minimal work: theoretical minimum and practical minimum.

The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the …

the basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, bond work index, bulk density, specific...

First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value (net Hp-hr/t) from an empirical formula.

Bond/Barratt Specific Energy Consumption SABC Model. This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi-stage crushing and single-stage ball milling (E ssbm) including Rowland efficiency factors.The circuit E total is equal to the E ssbm plus an inefficiency factor …

However, this requires a significant amount of ore samples, a lot of labor and the pilot plants. Fred Bond published an article in 1961, which, described the procedure for testing ores for a Bond Ball Index. This parameter is still one of the most demanded tools in the design, evaluation and optimization of ball grinding plants around the world.